3 replies to this topic

[Jopeth]

People,

I'm not sure if my calculations were correct on the catalytic reactor. The literature I gathered said that the first pass on the reactor was 15% and the overall conversion was 98% through recycling. 35MT of NH3 was produced after the process. Could you guide me in the calculations? The drawing is attached herewith. I just wanted to confirm if my calculations were correct. Thanks  nh3.png   15.36KB   46 downloads

[Art Montemayor]

Jopeth:

You ask for guidance in the calculations. You further state that you want to confirm if your calculations are correct. This is a good procedure for making sure that what you have done is correct and worthy of handing in as your assignment.

However, you haven’t furnished your calculations for us to check them out for you, making sure you haven’t made any mistakes. Did you forget to upload your detailed calculations? Am I missing something here or am I being naïve?

We can’t confirm what we haven’t received. Please follow the detailed instruction:

• Click on “Add Reply”;
• Go to the bottom of the text box where it says “Attachments”; fill-in the blank box with the file you want to upload or use the “Browse” button;
• After selecting the file you want to upload, click on “Attach this file”.

Await your detailed calculations.

[Jopeth]

Engr. Montemayor,

Sorry for the late reply Engr. Art Montemayor. I forgot to upload my calculations, but I already checked it to my professor and he said it was wrong but have not the time to explain fully to me what went wrong. This isn't my assignment, I just wanted to learn material balance recycle with an equilibrium reactor. I am puzzled on how to perform calculations with such system. I know I should know this by now but I rather ask than not to know this in time. keq = 1.64x10^-4. I really don't know what to do and can't upload any calculations because I stop in knowing the concentrations of the product. Maybe i'm just too stressed lately. Sorry for that Engr. Art. I do want to know step by step procedures in calculations for me to recall things.


Thanks.


Jopeth

Edited by Jopeth, 15 January 2011 - 08:56 AM.

[kkala]

I dare revert to the thread of Jan 2011, since the issue of purge is involved. Overall conversion 98% can mean in the specific case that rest 2 % is purged. Considering that pure nitrogen is produced through liquid air fractionation and contains Argon (Ar) as impurity, purge deems necessary.
Attached "NH3balance.xls" tries to clarify streams around NH3 reactor (35000 kg/h NH3), given that overall conversion = 98% and conversion per pass = 15%. We might have a better picture if Ar were also considered in calculations.

Attached Files

•  NH3balance.xls   22.5KB   156 downloads